A Study of BRIA-OTS Cellular Immunotherapy in Metastatic Recurrent Breast Cancer

August 23, 2024 updated by: BriaCell Therapeutics Corporation

This is an open-label Phase 1/2a study. Once the safety of the BC1 cell line alone has been demonstrated in Phase 1, in Phase 2, patients will be treated with the Bria-OTS regimen (see below) and a clinically available check point inhibitor (CPI).

During the monotherapy phase of Phase 1, one patient will be treated intradermally every 2 weeks for 6 weeks (4 doses) with an initial dose of the BC1 cell line. If this dose is tolerated, the next patient will receive an increased dose of BC1. If once again tolerated, the third patient will receive a further dose increase of the BC1. Once at least 3 patients have been safely treated with the BC1 cell line, with no dose-limiting toxicity (DLT), the combinational phase of the study will commence.

Following the monotherapy phase, patients will be treated with BC1 and the Bria-OTS regimen (see below) every 3 weeks, plus a CPI at the FDA approved labelled dose and schedule. There will be at least a 2-week spacing between enrollment of each of the first three subjects in the study in order to assess for any early unanticipated risk(s).

During the Phase 1 combination and Phase 2 expansion phases, all patients will be treated with BC1 cells as part of the Bria-OTS regimen, which includes cyclophosphamide 300 mg/m2 2-3 days prior to BC1 cell inoculation, and peginterferon alpha-2a administered on the same day, following BC1 cell inoculation.

Study Overview

Detailed Description

Open-label Phase 1/2a study.

Once the safety of the BC1 cell line alone has been demonstrated in Phase 1, in Phase 2, patients will be treated with the Bria-OTS regimen (see below) and a check point inhibitor (CPI).

During the monotherapy phase of Phase 1, one patient will be treated intradermally every 2 weeks for 6 weeks (4 doses) with an initial dose of the BC1 cell line. If this dose is tolerated, the next patient will receive an increased dose of BC1 cells. If once again tolerated, the third patient will receive a further increased dose of BC1. Once at least 3 patients have been safely treated with the BC1 cell line, with no dose-limiting toxicity (DLT), the combinational phase of the study will commence.

Following the monotherapy phase, patients will be treated with BC1 and the Bria-OTS regimen (see below) every 3 weeks, plus a CPI at the FDA approved labelled dose and schedule. There will be at least a 2-week spacing between enrollment of each of the first three subjects in the study in order to assess for any early unanticipated risk(s).

During the Phase 1 combination and Phase 2 expansion phases, all patients will be treated with BC1 cells as part of the Bria-OTS regimen, which includes cyclophosphamide 300 mg/m2 2-3 days prior to BC1 cell inoculation, and peginterferon alpha-2a administered on the same day, following BC1 cell inoculation.

Imaging studies will be performed at screening for baseline prior to first treatment; after the completion of the monotherapy phase just before starting the combination phase, and subsequently every 9 weeks for the first 6 months then q12 weeks thereafter while on treatment.

Patients who develop progressive disease on imaging, may remain on treatment as long as the Investigator feels they are deriving clinical benefit and there is no reasonable, meaningful, clinical alternative therapy available. Subjects will continue to be followed for time on subsequent therapy (PFS2) and survival by phone call or medical record review, every 3 months for up to 2 years.

Study Drug, Dosage, and Mode of Administration:

The Part 1 monotherapy phase of Phase 1 will proceed as follows for each patient:

Subject 1, Q2w for 4 doses Subject 2, Q2w for 4 doses Subject 3, Q2w for 4 doses

Initially, safety will be assessed on these 3 subjects. DLTs are defined as CTCAE Grade 3 or 4 adverse events that are suspected to be possibly related to study treatment.

If 1 of 3 Phase 1 subjects experience a DLT, that dose cohort will be expanded to another 3 patients before the combinational phase begins. If none of the patients in the expanded cohort experience a DLT (DLT rate of 1/4), the study will move into Bria-OTS and CPI combination. The dose for the combination will be either the highest dose at which no DLT is observed among the first 3 patients or the 3 patient expanded cohort dose level. In Phase 1, DLTs for determining the combinational BC1 dose will be observed until the first scheduled assessment. If the Phase 1 DLT rate is ≥ 2/4, an additional 3 patients will be dosed using the next lower dose level or 10 million cells (whichever is higher). If none of the 3 subjects experience dose-limiting toxicities (DLTs), that determined BC1 MTD dose will be included in the Part 2 combinational phase of Phase 1 along with a CPI. If a tolerated dose for BC1 cell line cannot be identified, further investigation will be paused, the data reviewed and may resume at a lower dose only with protocol amendment and IRB approval.

Following the Phase 1, Part 1 monotherapy phase, 3 patients will be treated every 3 weeks with the Bria-OTS regimen with a CPI in the Part 2 combination phase. The Bria-OTS regimen consists of cyclophosphamide 300 mg/m2 2-3 days prior to BC1 cell line inoculation. On the same day as the cell inoculation, subjects will receive peginterferon alpha-2a. Subjects will also receive the CPI on the same day of the cell inoculation according to approved dosing.

Once 3 patients have been safely treated with the Bria-OTS regimen and CPI for 2 cycles, Phase 2 will enroll an expansion cohort, consisting of up to an additional 9 subjects (for a total of 12 treated with the Bria-OTS regimen and CPI).

Study Type

Interventional

Enrollment (Estimated)

18

Phase

  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

    • California
      • Santa Monica, California, United States, 90403
        • Recruiting
        • Sarcoma Oncology Center
        • Contact:
        • Contact:
        • Principal Investigator:
          • Sant Chawla, MD
        • Sub-Investigator:
          • Victoria Chua-Alcala, MD

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Key Inclusion Criteria:

  1. Histological confirmed recurrent metastatic breast cancer which has failed prior

    therapy defined as:

    1. Human epidermal growth factor 2 (EGFR2, HER2) positive tumors must have failed therapy with at least 2 anti-HER2 agents
    2. HER2 negative and either ER or PR positive tumors: must be refractory to hormonal therapy and previously treated with at least 2 hormone based targeted therapy containing regimens.
    3. Triple-negative and inflammatory tumors must have exhausted other curative intent therapies including prior treatment with a taxane and platinum-based agent
    4. All other MBC types must have exhausted other curative intent therapies including any genomic or germline directed targeted therapy having available approved drug(s)
    5. Patients with new or progressive breast cancer metastatic to the brain will be eligible, provided:

    i. The brain metastases must be clinically stable (without evidence of progressive disease by imaging) for at least 4 weeks, prior to first dose.

    ii. There is no need for steroids and patients have not had steroids for at least 2 weeks prior to the first dose.

  2. Be 18 years of age or older.
  3. Have expected survival of at least 4 months.
  4. Have adequate performance status (up to and including ECOG 2)
  5. Patients must be stable with all known or expected toxicities from previous treatment including:

    1. Prior immune related toxicity must not have exceeded Grade 2 with exception of stable endocrinopathy (endocrinopathy if well-managed, is not exclusionary).
    2. Toxicity of prior therapy that has not recovered to ≤ grade 1 or baseline (with the exception of any grade of alopecia, adequately treated endocrinopathy, and anemia not requiring transfusion support).

Exclusion Criteria:

  1. Concurrent anti-cancer treatment.
  2. Recent chemotherapy, radiotherapy, or other anti-cancer treatment within 3 weeks of first protocol treatment.
  3. Participant has not recovered adequately from toxicities and/or complications from surgical intervention before starting study drug.
  4. History of clinical hypersensitivity to the designated therapy, as specified in the protocol or to any components used in the preparation of any cell line in this study.
  5. History of clinical hypersensitivity to any protocol specified therapy.
  6. BUN >30 in conjunction with a creatinine >2, or calculated creatinine clearance (CrCl) <30 mL/min (GFR can be used in place of creatinine or CrCl).
  7. Absolute granulocyte count < 1000; platelets <50,000.
  8. Bilirubin >2.0; alkaline phosphatase >4x upper limit of normal (ULN); ALT/AST >2x ULN. For patients with hepatic metastases, ALT/AST >5x ULN is exclusionary.
  9. Proteinuria >1+ on urinalysis or >1 gm/24hr.
  10. New York Heart Association stage 3 or 4 cardiac disease.
  11. A pleural or pericardial effusion of moderate severity or worse.
  12. Any woman of childbearing potential (i.e., has had a menstrual cycle within the past year and has not been surgically sterilized), unless she: agrees to take appropriate precautions to avoid becoming pregnant during the study and has a negative serum pregnancy test within 7 days prior to starting treatment.
  13. Men who are fertile/reproductively competent, should take appropriate precautions to avoid fathering a child for the duration of the study.
  14. Women who are pregnant or nursing.
  15. Patients with concurrent second malignancy.
  16. Persons with previous malignancies requiring treatment within the past 24 months.
  17. Patients who have clinical or laboratory features indicative of AIDS and are HIV positive (by self-report).
  18. Have a diagnosis of immunodeficiency, or is receiving chronic systemic steroid therapy (doses exceeding 10 mg daily of prednisone equivalent), or any other form of immunosuppressive therapy within 21 days prior to first dose of study treatment.
  19. Patients who are on treatment for an autoimmune disease, unless specifically approved by the Investigator and the Sponsor.
  20. Patients with severe psychiatric (e.g., schizophrenia, bipolar, or borderline personality disorder) or other clinically progressive major medical problems, unless approved by the Investigator and Sponsor.
  21. Patients may not be on a concurrent clinical trial, unless approved by Investigator and Sponsor.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Phase 1, Part 1 Monotherapy Phase

Subject 1, Q2w for 4 doses

Subject 2, Q2w for 4 doses

Subject 3, Q2w for 4 doses Treatment is administered every 2 weeks for a total of 4 doses.

Initially, safety will be assessed on these 3 subjects. DLTs are defined as CTCAE Grade 3 or 4 adverse events that are suspected to be possibly related to study treatment.

If 1 of 3 Phase 1 subjects experience a DLT, that dose cohort will be expanded to another 3 patients before the combinational phase begins. A total of 3-6 subjects will be assessed for safety.

BC1 cell line is a different experimental, HER-2 positive, allogeneic, whole cell BC cell lines designed to secrete GM-CSF in situ and augment dendritic cell activity. Similar to the SV-BR-1-GM cell line (NCT03328026, IND 10312), the BC cell line is derived from the BC parent cell line, SV-BR-1, which expresses multiple tumor associated antigens (TAAs)
Experimental: Phase 1, Part 2 Combination Phase

3 subjects will be treated every 3 weeks with the Bria-OTS regimen with a CPI (tislelizumab) in the Part 2 combination phase.

The Bria-OTS regimen consists of cyclophosphamide 300 mg/m2 2-3 days prior to BC1 cell line inoculation. On the same day as the cell inoculation, subjects will receive peginterferon alpha-2a. Subjects will also receive the CPI (tislelizumab) on the same day of the cell inoculation according to approved dosing.

Treatment is administered every 3 weeks in combination with the Bria-OTS regimen and CPI (tislelizumab).

Biological: BC1

  • BC1 inoculation intradermally at 4 sites

Drug: Low dose cyclophosphamide

  • Pretreatment with low dose cyclophosphamide 2-3 days prior to BC1 inoculation

Drug: Interferon

  • Subjects will receive low dose peginterferon alpha-2a on the same day as cell inoculation.

Drug: Tislelizumab

  • CPI treatment will also be given on the same day as cell inoculation.
Experimental: Phase 2 Expansion Cohort

Once 3 patients have been safely treated with the Bria-OTS regimen and CPI (tislelizumab) for 2 cycles, Phase 2 will enroll an expansion cohort, consisting of up to an additional 9 subjects (for a total of 12 treated with the Bria-OTS regimen and CPI).

The Bria-OTS regimen consists of cyclophosphamide 300 mg/m2 2-3 days prior to BC1 cell line inoculation. On the same day as the cell inoculation, subjects will receive peginterferon alpha-2a. Subjects will also receive the CPI (tislelizumab) on the same day of the cell inoculation according to approved dosing.

Treatment is administered every 3 weeks in combination with the Bria-OTS regimen and CPI (tislelizumab).

Biological: BC1

  • BC1 inoculation intradermally at 4 sites

Drug: Low dose cyclophosphamide

  • Pretreatment with low dose cyclophosphamide 2-3 days prior to BC1 inoculation

Drug: Interferon

  • Subjects will receive low dose peginterferon alpha-2a on the same day as cell inoculation.

Drug: Tislelizumab

  • CPI treatment will also be given on the same day as cell inoculation.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Safety as assessed by adverse events (AEs), including serious adverse events (SAEs)
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total
Total number of AEs
Throughout study period plus 4 weeks, approximately 16 weeks total
Evaluate the Proportion of Patients with Abnormalities in Safety Laboratory Parameters that occur in patients treated with BC1 and BC1 administered in combination with CPI (tislelizumab)
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total

To evaluate the safety of BC1 as assessed by:

o The Proportion of Patients with Abnormalities in Safety Laboratory Parameters

Throughout study period plus 4 weeks, approximately 16 weeks total
Evaluate changes in the electrocardiogram QT interval that occur in patients treated with BC1 and BC1 administered in combination with CPI (tislelizumab). [Safety]
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total

To evaluate the safety of BC1 as assessed by:

o Electrocardiograms (ECG) with measurement of the QT interval

Throughout study period plus 4 weeks, approximately 16 weeks total
Evaluate the proportion of patients with abnormal physical examination findings including vital signs
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total

To evaluate the safety of BC1 as assessed by:

o The Proportion of Patients with Abnormalities in Physical Examination Findings and Abnormal Vital Signs

Throughout study period plus 4 weeks, approximately 16 weeks total

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Tumor response as assessed by Objective response rate (ORR), defined as complete response (CR) or partial response (PR) per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total
Quantify tumor ORR
Throughout study period plus 4 weeks, approximately 16 weeks total
Tumor response as assessed by Clinical response rate as determined by local standard of care imaging and investigators
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total
Determine clinical relevance of tumor response
Throughout study period plus 4 weeks, approximately 16 weeks total
Tumor response as assessed by Non-progressive rate (aka: clinical benefit rate), defined as CR, PR, or stable disease (SD) per RECIST 1.1 and as determined by local standard of care imaging and investigators
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total
Quantify change in tumor rate of progression
Throughout study period plus 4 weeks, approximately 16 weeks total
Tumor response as assessed by Duration of response (DoR)
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total
Quantify tumor duration of response to therapy
Throughout study period plus 4 weeks, approximately 16 weeks total

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
PFS and OS treated with HLA-characterized cellular immunotherapy
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total

To evaluate the effect of the BC1 on progression-free survival (PFS)

• To assess the single agent activity of the BC1 regimen in the sample cohort using PFS, ORR, and CBR, and changes in circulating tumor cells before and after therapy.

Throughout study period plus 4 weeks, approximately 16 weeks total
Evaluate Immune Responses
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total
Immune responses will be evaluated by known and hypothesized covariates including DTH
Throughout study period plus 4 weeks, approximately 16 weeks total
Stratified Analysis of Outcomes by HLA type
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total
Determine specific HLA type for analysis
Throughout study period plus 4 weeks, approximately 16 weeks total
Stratified Analysis of Outcomes by Tumor Grade
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total

Classify the tumor based on its differentiation:

  • well-differentiated or Grade 1
  • moderately differentiated or Grade 2
  • poorly differentiated or Grade 3
Throughout study period plus 4 weeks, approximately 16 weeks total
Stratified analysis of Circulating Cancer cell or Cancer-associated cell expression of PD-L1, PD-L2, and other selected antigens such as the cancer/testis antigen PRAME
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total
Measure the expression relevant antigens on circulating cancer cells or cancer-associated cells, which may predict response to immunotherapy.
Throughout study period plus 4 weeks, approximately 16 weeks total
Second Progression-Free Survival (PFS2) on subsequent therapy
Time Frame: Throughout study period plus 4 weeks, approximately 16 weeks total
Evaluate effectiveness of subsequent therapy in delaying further progression from the time of randomization to the second disease progression or death from any cause.
Throughout study period plus 4 weeks, approximately 16 weeks total

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Investigators

  • Study Chair: Giuseppe Del Priore, MD, MPH, BriaCell Therapeutics Corp
  • Study Director: Victoria Chua-Alcala, MD, Sarcoma Oncology Research Center

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

May 29, 2024

Primary Completion (Estimated)

April 30, 2025

Study Completion (Estimated)

October 30, 2025

Study Registration Dates

First Submitted

June 11, 2024

First Submitted That Met QC Criteria

June 20, 2024

First Posted (Actual)

June 24, 2024

Study Record Updates

Last Update Posted (Actual)

August 26, 2024

Last Update Submitted That Met QC Criteria

August 23, 2024

Last Verified

August 1, 2024

More Information

Terms related to this study

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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